/**
 * #      395
 * 名称   至少有 K 个重复字符的最长子串
 * 链接   https://leetcode-cn.com/problems/longest-substring-with-at-least-k-repeating-characters
 * 题解   [359](https://leetcode-cn.com/problems/longest-substring-with-at-least-k-repeating-characters/solution)
 * 通过率 51.9%
 * 难道   中等
 */

